The flames from the burner are going upwards and they push the balloon into the air
0%
The helium they contain is lighter than air
100%
The heat from the burners causes the air inside to become less dense
0%
They only rise because the pilot throws out some weight from the basket
Q.2.
Which state(s) of matter is (or are) fluids?
0%
Solids and liquids
0%
Liquids only
100%
Liquids and gases
0%
Gases only
Q.3.
In what substances can convection occur?
0%
Solids
0%
Only liquids
100%
Liquids and gases
0%
Only gases
Q.4.
"Particles with more energy move in to take the place of particles with less energy" What method of heat transfer is being described in the previous sentence?
0%
Sublimation
0%
Conduction
100%
Convection
0%
Radiation
Q.5.
On a sunny day, why is it slightly harder to swim back to the shore of a lake than to swim towards the centre?
0%
The sun makes the water at the edge of the lake expand more than at the centre so you are swimming uphill
100%
The sun heats shallow water at the edge faster than the deep water, creating a convection current that flows towards the centre
0%
You are more tired because you have already swum out to the centre of the lake
0%
There is no difference
Q.6.
How does extra heat affect the particles of a metal?
100%
It makes them vibrate faster
0%
It makes them move around more and change places, reducing its density
0%
It slows down the movement of the particles
0%
It melts them
Q.7.
What is the main way that heat passes through a brick in the wall of a building?
0%
Convection
100%
Conduction
0%
Radiation
0%
All of the above
Q.8.
Houses built with thick stone walls usually stay cooler inside during the summer than houses built with thinner brick walls. Why might this be?
100%
Conduction is slower through the thicker walls
0%
No convection can occur through the thicker walls
0%
No conduction can occur through the thicker walls
0%
The clay used to make bricks always contains some impurities that make it a better conductor of heat than stone
Q.9.
Why are metals good heat conductors?
0%
They are shiny and solid
0%
Their particles are far apart
100%
Their particles are packed close together
0%
They are malleable and ductile
Q.10.
Thunderstorms are created by which form(s) of energy transfer in the atmosphere?
100%
Convection
0%
Evaporation and conduction
0%
Radiation only
0%
Conduction and radiation
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